kube-cron-slack

Kubernetes Slack Notification Cron Job POC

DockerHub Image

https://hub.docker.com/r/mpatters72/kube-cron-slack/

Create a Slack Webhook URI

https://my.slack.com/services/new/incoming-webhook

Setup Secrets

Copy Template

cp templates/kube-cron-slack-secret.yaml /tmp/

Get base64 encoded values

https://kubernetes.io/docs/concepts/configuration/secret/#creating-a-secret-manually

• Use the webhook URI you generated here and your desired slack channel

echo -n 'https://hooks.slack.com/services/UseYour/RealChannel/URIHERE' | base64
aHR0cHM6Ly9ob29rcy5zbGFjay5jb20vc2VydmljZXMvVXNlWW91ci9SZWFsQ2hhbm5lbC9VUklIRVJF
echo -n '#my-slack-channel' | base64
I215LXNsYWNrLWNoYW5uZWw=

Replace base64 files in new file tmp/kube-cron-slack-secret.yaml

Add secret to kubernetes

kubectl apply -f /tmp/kube-cron-slack-secret.yaml

Verify

kubectl get secret kube-cron-slack -o yaml

Setup CronJob

Double-check settings in templates/kube-cron-slack-cronjob

• e.g. do you really want this running every 2 minutes?

• See: https://kubernetes.io/docs/tasks/job/automated-tasks-with-cron-jobs/

• Also note we are exposing secret and pod info to pod:

• See: https://kubernetes.io/docs/tasks/inject-data-application/environment-variable-expose-pod-information/

Copy template and make any desired edits and apply it

cp templates/kube-cron-slack-cronjob.yaml /tmp
# make any edits to /tmp/kube-cron-slack-cronjob.yaml
# apply it
kubectl apply -f /tmp/kube-cron-slack-cronjob.yaml

Troubleshooting

kubectl get cronjob
kubectl get jobs --watch